界面可控硫醇SAMs纳米金修饰金电极的电化学行为研究

Study on Electrochemical Behavior of Controllable Interface Alkanethiols Self-assembled Monolayers and Au Nanoparticles Modified Gold Electrode

在裸金电极上自组装不同比例的4,4'-二甲基联苯硫醇(MTP)和硫辛酸(TA)混合液,形成自组装膜(MTP+TA/Au SAMs),再修饰纳米金,制得纳米金混合巯基修饰金电极(AuNPs/MTP+TA/Au)。研究了纳米金混合巯基修饰金电极的电化学行为和阻抗行为,结果表明电极表面pH值的改变对电极表面的电子转移有重要影响。对葡萄糖传感器的制备条件、测定条件、抗干扰能力等进行了讨论,结果表明修饰电极的微结构和微环境有必要进一步研究。

The self-assembled monolayers （SAMs） of 4, 4＇-bis （methanethiol） biphenyl （MTP） and 6-thioctic acid （TA） were covalently combined on to a bare gold electrode to make self-assembled monolayers（TA ＋ MTP/Au SAMs）. It was then dipped into gold nanoparticles solution for a certain time to prepare the AuNPs/MTP ＋ TA/Au electrode. The electrochemical behaviors of the modified electrode were investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The results showed that the acidity variation of the electrode surface had an important influence on the e- lectron transfer. The preparation conditions, determination conditions and anti-interference ability of glucose sensor were discussed, which showed that it was necessary to further study the microstructure and microenvironment of the modified electrode.